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<div class="title">_kiss_fft_guts.h</div>  </div>
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<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">Copyright (c) 2003-2010, Mark Borgerding</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">All rights reserved.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">    * Neither the author nor the names of any contributors may be used to endorse or promote products derived from this software without specific prior written permission.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">/* kiss_fft.h</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">   defines kiss_fft_scalar as either short or a float type</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment">   and defines</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment">   typedef struct { kiss_fft_scalar r; kiss_fft_scalar i; }kiss_fft_cpx; */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &quot;kiss_fft.h&quot;</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &lt;limits.h&gt;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160; </div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#define MAXFACTORS 32</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">/* e.g. an fft of length 128 has 4 factors </span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> as far as kissfft is concerned</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment"> 4*4*4*2</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160; </div>
<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="structkiss__fft__state.html">   28</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structkiss__fft__state.html">kiss_fft_state</a>{</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    <span class="keywordtype">int</span> nfft;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    <span class="keywordtype">int</span> inverse;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    <span class="keywordtype">int</span> factors[2*MAXFACTORS];</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    <a class="code" href="structkiss__fft__cpx.html">kiss_fft_cpx</a> twiddles[1];</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;};</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160; </div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">  Explanation of macros dealing with complex math:</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">   C_MUL(m,a,b)         : m = a*b</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">   C_FIXDIV( c , div )  : if a fixed point impl., c /= div. noop otherwise</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">   C_SUB( res, a,b)     : res = a - b</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">   C_SUBFROM( res , a)  : res -= a</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">   C_ADDTO( res , a)    : res += a</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment"> * */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="preprocessor">#ifdef FIXED_POINT</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="preprocessor">#if (FIXED_POINT==32)</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="preprocessor"># define FRACBITS 31</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="preprocessor"># define SAMPPROD int64_t</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="preprocessor">#define SAMP_MAX 2147483647</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor"># define FRACBITS 15</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="preprocessor"># define SAMPPROD int32_t </span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="preprocessor">#define SAMP_MAX 32767</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160; </div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">#define SAMP_MIN -SAMP_MAX</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160; </div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="preprocessor">#if defined(CHECK_OVERFLOW)</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="preprocessor">#  define CHECK_OVERFLOW_OP(a,op,b)  \</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="preprocessor">    if ( (SAMPPROD)(a) op (SAMPPROD)(b) &gt; SAMP_MAX || (SAMPPROD)(a) op (SAMPPROD)(b) &lt; SAMP_MIN ) { \</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="preprocessor">        fprintf(stderr,&quot;WARNING:overflow @ &quot;</span> __FILE__ &quot;(%d): (%d &quot; #op&quot; %d) = %ld\n&quot;,__LINE__,(a),(b),(SAMPPROD)(a) op (SAMPPROD)(b) );  }</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160; </div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160; </div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="preprocessor">#   define smul(a,b) ( (SAMPPROD)(a)*(b) )</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="preprocessor">#   define sround( x )  (kiss_fft_scalar)( ( (x) + (1&lt;&lt;(FRACBITS-1)) ) &gt;&gt; FRACBITS )</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160; </div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="preprocessor">#   define S_MUL(a,b) sround( smul(a,b) )</span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160; </div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="preprocessor">#   define C_MUL(m,a,b) \</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="preprocessor">      do{ (m).r = sround( smul((a).r,(b).r) - smul((a).i,(b).i) ); \</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="preprocessor">          (m).i = sround( smul((a).r,(b).i) + smul((a).i,(b).r) ); }while(0)</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160; </div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="preprocessor">#   define DIVSCALAR(x,k) \</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="preprocessor">    (x) = sround( smul(  x, SAMP_MAX/k ) )</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160; </div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="preprocessor">#   define C_FIXDIV(c,div) \</span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="preprocessor">    do {    DIVSCALAR( (c).r , div);  \</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="preprocessor">        DIVSCALAR( (c).i  , div); }while (0)</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160; </div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="preprocessor">#   define C_MULBYSCALAR( c, s ) \</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="preprocessor">    do{ (c).r =  sround( smul( (c).r , s ) ) ;\</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="preprocessor">        (c).i =  sround( smul( (c).i , s ) ) ; }while(0)</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160; </div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="preprocessor">#else  </span><span class="comment">/* not FIXED_POINT*/</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160; </div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="preprocessor">#   define S_MUL(a,b) ( (a)*(b) )</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="preprocessor">#define C_MUL(m,a,b) \</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="preprocessor">    do{ (m).r = (a).r*(b).r - (a).i*(b).i;\</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="preprocessor">        (m).i = (a).r*(b).i + (a).i*(b).r; }while(0)</span></div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="preprocessor">#   define C_FIXDIV(c,div) </span><span class="comment">/* NOOP */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="preprocessor">#   define C_MULBYSCALAR( c, s ) \</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="preprocessor">    do{ (c).r *= (s);\</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="preprocessor">        (c).i *= (s); }while(0)</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160; </div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="preprocessor">#ifndef CHECK_OVERFLOW_OP</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;<span class="preprocessor">#  define CHECK_OVERFLOW_OP(a,op,b) </span><span class="comment">/* noop */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160; </div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="preprocessor">#define  C_ADD( res, a,b)\</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="preprocessor">    do { \</span></div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="preprocessor">        CHECK_OVERFLOW_OP((a).r,+,(b).r)\</span></div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;<span class="preprocessor">        CHECK_OVERFLOW_OP((a).i,+,(b).i)\</span></div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="preprocessor">        (res).r=(a).r+(b).r;  (res).i=(a).i+(b).i; \</span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="preprocessor">    }while(0)</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="preprocessor">#define  C_SUB( res, a,b)\</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="preprocessor">    do { \</span></div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="preprocessor">        CHECK_OVERFLOW_OP((a).r,-,(b).r)\</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;<span class="preprocessor">        CHECK_OVERFLOW_OP((a).i,-,(b).i)\</span></div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="preprocessor">        (res).r=(a).r-(b).r;  (res).i=(a).i-(b).i; \</span></div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="preprocessor">    }while(0)</span></div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="preprocessor">#define C_ADDTO( res , a)\</span></div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="preprocessor">    do { \</span></div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="preprocessor">        CHECK_OVERFLOW_OP((res).r,+,(a).r)\</span></div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="preprocessor">        CHECK_OVERFLOW_OP((res).i,+,(a).i)\</span></div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="preprocessor">        (res).r += (a).r;  (res).i += (a).i;\</span></div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<span class="preprocessor">    }while(0)</span></div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160; </div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;<span class="preprocessor">#define C_SUBFROM( res , a)\</span></div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="preprocessor">    do {\</span></div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;<span class="preprocessor">        CHECK_OVERFLOW_OP((res).r,-,(a).r)\</span></div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;<span class="preprocessor">        CHECK_OVERFLOW_OP((res).i,-,(a).i)\</span></div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;<span class="preprocessor">        (res).r -= (a).r;  (res).i -= (a).i; \</span></div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;<span class="preprocessor">    }while(0)</span></div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160; </div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160; </div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;<span class="preprocessor">#ifdef FIXED_POINT</span></div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;<span class="preprocessor">#  define KISS_FFT_COS(phase)  floor(.5+SAMP_MAX * cos (phase))</span></div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;<span class="preprocessor">#  define KISS_FFT_SIN(phase)  floor(.5+SAMP_MAX * sin (phase))</span></div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;<span class="preprocessor">#  define HALF_OF(x) ((x)&gt;&gt;1)</span></div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;<span class="preprocessor">#elif defined(USE_SIMD)</span></div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;<span class="preprocessor">#  define KISS_FFT_COS(phase) _mm_set1_ps( cos(phase) )</span></div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;<span class="preprocessor">#  define KISS_FFT_SIN(phase) _mm_set1_ps( sin(phase) )</span></div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;<span class="preprocessor">#  define HALF_OF(x) ((x)*_mm_set1_ps(.5))</span></div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="preprocessor">#  define KISS_FFT_COS(phase) (kiss_fft_scalar) cos(phase)</span></div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="preprocessor">#  define KISS_FFT_SIN(phase) (kiss_fft_scalar) sin(phase)</span></div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;<span class="preprocessor">#  define HALF_OF(x) ((x)*.5)</span></div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160; </div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;<span class="preprocessor">#define  kf_cexp(x,phase) \</span></div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;<span class="preprocessor">    do{ \</span></div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;<span class="preprocessor">        (x)-&gt;r = KISS_FFT_COS(phase);\</span></div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="preprocessor">        (x)-&gt;i = KISS_FFT_SIN(phase);\</span></div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;<span class="preprocessor">    }while(0)</span></div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160; </div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160; </div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;<span class="comment">/* a debugging function */</span></div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;<span class="preprocessor">#define pcpx(c)\</span></div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;<span class="preprocessor">    fprintf(stderr,&quot;%g + %gi\n&quot;</span>,(double)((c)-&gt;r),(double)((c)-&gt;i) )</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160; </div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160; </div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;<span class="preprocessor">#ifdef KISS_FFT_USE_ALLOCA</span></div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;<span class="comment">// define this to allow use of alloca instead of malloc for temporary buffers</span></div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;<span class="comment">// Temporary buffers are used in two case: </span></div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;<span class="comment">// 1. FFT sizes that have &quot;bad&quot; factors. i.e. not 2,3 and 5</span></div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;<span class="comment">// 2. &quot;in-place&quot; FFTs.  Notice the quotes, since kissfft does not really do an in-place transform.</span></div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;<span class="preprocessor">#include &lt;alloca.h&gt;</span></div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;<span class="preprocessor">#define  KISS_FFT_TMP_ALLOC(nbytes) alloca(nbytes)</span></div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;<span class="preprocessor">#define  KISS_FFT_TMP_FREE(ptr) </span></div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;<span class="preprocessor">#define  KISS_FFT_TMP_ALLOC(nbytes) KISS_FFT_MALLOC(nbytes)</span></div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;<span class="preprocessor">#define  KISS_FFT_TMP_FREE(ptr) KISS_FFT_FREE(ptr)</span></div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="ttc" id="astructkiss__fft__cpx_html"><div class="ttname"><a href="structkiss__fft__cpx.html">kiss_fft_cpx</a></div><div class="ttdef"><b>Definition:</b> kiss_fft.h:57</div></div>
<div class="ttc" id="astructkiss__fft__state_html"><div class="ttname"><a href="structkiss__fft__state.html">kiss_fft_state</a></div><div class="ttdef"><b>Definition:</b> _kiss_fft_guts.h:28</div></div>
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